s600 headed for failure???
 

today I heard a rattling, borderline grinding noise coming from the passenger side of engine near front. seems to be coming from directly below the intake manifold. the noise does increase with rpm. this is a '95 s600 v-12. no other performance issues noticed. any ideas as to what this may be? also does anybody know if this is obd2 computer and where I can find the computer hookup terminal? thanks for any help in diagnosing this.....[:@]